Internet Disconnection

Hi all
We have two routers (e.g Router 1 Gateway 192.168.1.1 & Router 2 Gateway 192.168.1.4) and three switches e.g. (Switch A, Switch B & Switch C.). Router 1 is connected with Switch A and Router 2 is connected with Switch B. The Problem is that users connected with Switch A has rarely internet disconnection and sometimes, those who are connected with Switch B, have problems in accessing the internet using gateway 192.168.1.1. If we switch over to Router 2 Gateway that is 192.168.1.4, then internet works perfectly.
Can you please help in solving the problems?
Note :- We have no prblems in accessing internal lan.
Thanks
Rajkumar

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Hi
Can u throw more light on how these switches are connected to each other. Are they connected to GIG ports or by simple last point connection.
I would see this as an issue with the connectivity between switches.

Please check the physical connectivity of Router 1. upto ISP
end. If it seems okay, Then trie by swap the router 1 and Router 2. Working
with 192.168.1.4 gateway denotes the switch and system are good in their
job.So...